Strain-structural plane slip-type rockburst failure mechanism analysis method for drill-and-blast method tunnel

Abstract

The present invention relates to the technical field of tunnel rockburst microseismic monitoring, and provides a strain-structural plane slip-type rockburst failure mechanism analysis method for a drill-and-blast method tunnel. The present invention collects strain-structural plane slip-type rockburst microseismic data during tunnel construction; in light of engineering geological survey data, performs microseismic monitoring and data analysis on strain-structural plane slip-type rockburst that has occurred in a tunnel, divides a strain-structural plane slip-type rockburst risk area, and determines a microseismic rockburst early warning area; and, by means of these data, deeply understands a microseismic activity law of strain-structural plane slip-type rockburst of deep-buried drill-and-blast method tunnels, discriminates respective functions of tensioning and shearing in rock failure processes, comprehensively analyzes the failure mechanism of strain-structural plane slip-type rockburst, and further obtains the failure mechanism of strain-structural plane slip-type rockburst of the deep-buried drill-and-blast method tunnels, providing an important theoretical basis for predicting and preventing rockburst disasters.

Description

Analysis method of strain-structure plane sliding rockburst failure mechanism in tunnels using drilling and blasting method Technical Field

[0001] The present invention relates to the technical field of tunnel rockburst microseismic monitoring, and in particular to a method for analyzing the damage mechanism of a tunnel strain-structural surface sliding type rockburst using a drilling and blasting method. Background Art

[0002] Rockbursts are a dynamic phenomenon characterized by the sudden release of elastic energy accumulated within the rock mass of underground engineering structures during excavation or external disturbances, resulting in the rupture and ejection of the surrounding rock. These phenomena are highly sudden, random, and dangerous. Based on their initiation mechanisms, rockburst types can be divided into strain-type rockbursts, strain-structural surface sliding rockbursts, and fracture-type rockbursts. The initiation mechanisms, fracture mechanisms, and damage scales of these different rockburst types vary significantly. Strain-structural surface sliding rockbursts occur more frequently in deep tunnels, affect a larger area, and exert greater destructive force, potentially triggering subsequent rockbursts. Therefore, it is necessary to develop appropriate rockburst warnings for strain-structural surface sliding rockbursts, and studying the damage mechanism of strain-structural surface sliding rockbursts is a primary prerequisite for developing such warnings.

[0003] Microseismic monitoring technology is currently being widely used in safety monitoring projects such as mines, underground laboratories, slopes, and tunnels in many countries, achieving a series of research results. Microseismic monitoring technology uses microseismic sensors deployed in different spatial locations to capture seismic wave information emitted by rock microfractures. This information is analyzed and processed to determine the time, location, magnitude, and energy release of the microseismic event. Based on this information, the internal stress state and damage status of the rock mass can be inferred, thereby providing early warning and assessment of rock mass stability.

[0004] Rockbursts in deep drill-and-blast tunnels are complex geological hazards, and their failure mechanisms have long been a hot topic of research in both engineering and academia. Existing research primarily focuses on rockburst types, causes, prediction, and prevention. However, in-depth analysis of the failure mechanisms of strain-structure plane slip rockbursts in deep tunnels remains lacking.

[0005] Furthermore, for the potential strain-structural surface slip rockbursts, experts and scholars primarily rely on early geological survey results or previously revealed on-site geological information to predict potential rockbursts, followed by failure mechanism analysis. However, due to the limited availability of this information and the fact that on-site geological surveys may indicate that structural surface slip has not yet been revealed, timely prediction of the rockburst failure mechanism is impossible, resulting in inaccurate early warning results and delayed warning times for strain-structural surface slip rockbursts. In summary, a specific analytical method for the failure mechanism of strain-structural surface slip rockbursts has yet to be established.

[0006] Therefore, by applying microseismic monitoring technology in deep-buried drilling and blasting tunnel construction, the microseismic activity information of strain-structural surface sliding type rockbursts that have occurred is analyzed to confirm the rockburst microseismic warning area. Therefore, it is necessary to propose a set of methods to systematically analyze the failure mechanism of rock mass under complex stress conditions, which can be used to distinguish the respective roles of tension and shear in the rock mass failure process and comprehensively analyze the failure mechanism of strain-structural surface sliding type rockbursts.

[0007] Summary of the Invention

[0008] In response to the shortcomings of the existing technology, the present invention provides a method for analyzing the strain-structural surface sliding type rockburst failure mechanism of deep-buried drilling and blasting tunnels; it solves the problem that strain-structural surface sliding type rockburst is difficult to warn during the excavation of deep-buried drilling and blasting tunnels. By analyzing the laws of microseismic activity and the number of structural surface occurrences, the strain-structural surface sliding type rockburst failure mechanism of deep-buried drilling and blasting tunnels is obtained, laying the foundation for the accurate prediction and forecast of deep-buried hard rock tunnel disasters.

[0009] A method for analyzing the strain-structure plane sliding type rockburst failure mechanism of a tunnel using the drilling and blasting method comprises the following steps:

[0010] Step S1: Based on engineering geological conditions, stress conditions, and external disturbance conditions, the strain-structural surface slip rockburst risk area is divided, microseismic monitoring is carried out in the rockburst risk area, and the rockburst warning area is determined;

[0011] The engineering geological conditions of the strain-structural surface slip rockburst risk zone are that the structural surface is developed, the tunnel tangential stress intersects with the structural surface horizontally or at an angle less than a set angle, the external disturbance condition is blasting dynamic disturbance, and there is a disturbance source in the strain-structural surface slip rockburst risk zone;

[0012] The rockburst warning area is determined by studying the spatial distribution of rockburst risk areas within the tunnel. The rockburst warning area includes: the distribution range of microseismic events in front of and behind the tunnel face, the distribution range of microseismic events on the left and right sides perpendicular to the tunnel axis, and the distribution range of microseismic events above and below the tunnel axis.

[0013] Step S2: Analyze the occurrence and quantity of the structural surface of the strain-structural surface sliding type rock burst that has occurred;

[0014] The structural surface attitude of strain-structural surface sliding type rockburst includes the inclination and dip of the structural surface, and the number of structural surfaces of strain-structural surface sliding type rockburst is reflected by the comprehensive index of the structural surface.

[0015] The comprehensive index is calculated according to the following formula: L P =(L1+L2+L3+.......L N ) / A

[0016] Among them, L P Represents the comprehensive index of the structural surface, A represents the area of ​​a window, L N Represents N structural surfaces within the window.

[0017] Step S3: Collect and process the microseismic monitoring information in the rockburst warning area, including data cleaning, waveform recognition, time-based picking, and format conversion;

[0018] The microseismic monitoring information includes: spatial distribution characteristics of microseismic events, microseismic energy evolution law, cumulative energy release rate during rockburst incubation, dynamic stress drop evolution characteristics during rockburst incubation, and evolution of rock fracture types at different stages of strain-structural surface slip rockburst;

[0019] The spatial distribution characteristics of the microseismic events are obtained by collecting and processing microseismic monitoring data;

[0020] Step S4: Comprehensively analyze the occurrence and quantity of the strain-structure surface sliding type rockburst structural surface obtained in S2 and S3, and the microseismic monitoring information, to obtain the occurrence and quantity laws of the structural surface and the characteristic laws of microseismic activity, and analyze them in combination with the strain-structure surface sliding type rockburst rupture mechanism.

[0021] By extracting microseismic monitoring information, the corner frequency in the seismic moment frequency domain and the shear wave velocity parameters near the earthquake source are obtained, the dynamic stress drop is calculated, and the evolution characteristic law of the dynamic stress drop is obtained. The calculation formula is:

[0022] Where Δσ represents the dynamic stress drop, M0 represents the seismic moment, and f c represents the corner frequency in the frequency domain, β represents the source shear wave velocity, and k represents the corner frequency f c The relationship between the earthquake source rupture radius r.

[0023] Secondary processing of microseismic monitoring information is performed to evaluate the rupture type, which is specifically obtained from the P-wave development degree. D The definition is as follows:

[0024] Where N is the number of sensors triggered by the microseismic event; is the amplitude of the first P-wave motion recorded in the triggered i-th sensor; is the maximum amplitude of the waveform recorded in the triggered i-th sensor.

[0025] Step S5: Based on the P-wave development, combined with on-site and electron microscope scanning, the judgment criteria for the rupture type are comprehensively analyzed as follows:

[0026] The beneficial effects of adopting the above technical solution are:

[0027] The present invention provides a method for analyzing the failure mechanism of strain-structural surface sliding-type rockburst in deep-buried drilling and blasting tunnels. The present invention solves the problem of difficulty in early warning of strain-structural surface sliding-type rockburst during the excavation of deep-buried drilling and blasting tunnels. By analyzing the laws of microseismic activity and the number of structural surface occurrences, the present invention obtains the failure mechanism of strain-structural surface sliding-type rockburst in deep-buried drilling and blasting tunnels. This method lays the foundation for the accurate prediction and forecasting of disasters in deep-buried hard rock tunnels, provides a scientific basis for early warning and prevention of strain-structural surface sliding-type rockbursts, and has important engineering practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a flow chart of an analysis method according to an embodiment of the present invention;

[0029] FIG2 is a spatial distribution diagram of microseismic events according to an embodiment of the present invention;

[0030] Figure (a) shows the distribution characteristics of microseismic events along the tunnel axis, and Figure (b) shows the distribution characteristics of microseismic events along the tunnel cross section.

[0031] FIG3 shows the evolution law of microseismic energy in an embodiment of the present invention;

[0032] Figure (a) shows the incubation process of strain-structure surface sliding type rockburst, and Figure (b) shows the energy characteristic analysis of microseismic rockburst of strain-structure surface sliding type.

[0033] FIG4 shows the dynamic stress drop evolution characteristics in an embodiment of the present invention;

[0034] FIG5 shows the evolution law of the fracture type in an embodiment of the present invention;

[0035] FIG6 is a structural surface layout diagram and a window in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0037] The present invention utilizes the law of energy evolution to obtain the energy generated by shear rupture and tensile rupture during the occurrence of strain-structural surface sliding type rockburst; utilizes dynamic stress drop to determine at which stage the stress change is concentrated and the evolution of microcracks during the occurrence of strain-structural surface sliding type rockburst; through the evolution of strain-structural surface sliding type rockburst rupture type, the proportion of tension and shear and the released energy after destruction can be determined; through on-site investigation, the properties of the structural surface of the rockburst area are determined, and finally, a comprehensive analysis is conducted to determine the specific strain-structural surface sliding type rockburst failure mechanism of the deep buried drilling and blasting tunnel.

[0038] A method for analyzing the strain-structure plane sliding type rockburst failure mechanism of a tunnel using the drilling and blasting method, as shown in FIG1 , includes the following steps:

[0039] Step S1: Based on engineering geological conditions, stress conditions, and external disturbance conditions, the strain-structural surface slip rockburst risk area is divided, microseismic monitoring is carried out in the rockburst risk area, and the rockburst warning area is determined;

[0040] The engineering geological conditions of the strain-structural surface slip rockburst risk zone are that the structural surface is developed, the tunnel tangential stress intersects with the structural surface horizontally or at an angle less than a set angle, the external disturbance condition is blasting dynamic disturbance, and there is a disturbance source in the strain-structural surface slip rockburst risk zone;

[0041] The rockburst warning area is determined by studying the spatial distribution of rockburst risk areas within the tunnel. The rockburst warning area includes: the distribution range of microseismic events in front of and behind the tunnel face, the distribution range of microseismic events on the left and right sides perpendicular to the tunnel axis, and the distribution range of microseismic events above and below the tunnel axis.

[0042] In this embodiment, strain-structural surface slip rockburst risk zones are divided based on engineering geological conditions, on-site stress conditions, and external disturbance conditions. Microseismic monitoring is carried out in rockburst risk zones. The monitoring area is determined by studying the spatial distribution of rockburst and microseismic activity within the tunnel. Generally, an early warning unit is defined as the area 15 m in front of the tunnel face and 20 m away from the tunnel face.

[0043] Step S2: Analyze the occurrence and quantity of the structural surface of the strain-structural surface sliding type rock burst that has occurred;

[0044] The structural surface attitude of strain-structural surface sliding type rockburst includes the inclination and dip of the structural surface, and the number of structural surfaces of strain-structural surface sliding type rockburst is reflected by the comprehensive index of the structural surface.

[0045] In this embodiment, microseismic information in the warning area is selected, such as when a strain-structure surface slip rock burst occurs, and microseismic information analysis is performed to obtain spatial distribution characteristics of microseismic events.

[0046] The comprehensive index is calculated according to the following formula: L P =(L1+L2+L3+.......L N ) / A

[0047] Among them, L P Represents the comprehensive index of the structural surface, A represents the area of ​​a window, L N Represents N structural surfaces within the window.

[0048] Step S3: Collect and process the microseismic monitoring information in the rockburst warning area, including data cleaning, waveform recognition, time picking, and format conversion, to ensure the accuracy and availability of the data.

[0049] The microseismic monitoring information includes: spatial distribution characteristics of microseismic events, microseismic energy evolution law, cumulative energy release rate during rockburst incubation, dynamic stress drop evolution characteristics during rockburst incubation, and evolution of rock fracture types at different stages of strain-structural surface slip rockburst;

[0050] The spatial distribution characteristics of the microseismic events are obtained by collecting and processing microseismic monitoring data;

[0051] By processing and analyzing microseismic information, the collected data is processed, including data cleaning, waveform recognition, arrival time picking, format conversion, etc., to obtain the spatial distribution characteristics of microseismic events, as shown in Figure 3.

[0052] Step S4: Comprehensively analyze the occurrence and quantity of the strain-structure surface sliding type rockburst structural surface obtained in S2 and S3, and the microseismic monitoring information, to obtain the occurrence and quantity laws of the structural surface and the characteristic laws of microseismic activity, and analyze them in combination with the strain-structure surface sliding type rockburst rupture mechanism.

[0053] By extracting microseismic monitoring information, the corner frequency in the seismic moment frequency domain and the shear wave velocity parameters near the earthquake source are obtained, the dynamic stress drop is calculated, and the evolution characteristic law of the dynamic stress drop is obtained. The calculation formula is:

[0054] Where Δσ represents the dynamic stress drop, M0 represents the seismic moment, and f c represents the corner frequency in the frequency domain, β represents the source shear wave velocity, and k represents the correlation of the corner frequency f depending on the type of model used. c The relationship between the earthquake source rupture radius r.

[0055] Secondary processing of microseismic monitoring information is performed to evaluate the rupture type, which is specifically obtained from the P-wave development degree. D The definition is as follows:

[0056] Where N is the number of sensors triggered by the microseismic event; is the amplitude of the first P-wave motion recorded in the triggered i-th sensor; is the maximum amplitude of the waveform recorded in the triggered i-th sensor.

[0057] Step S5: Based on the P-wave development, combined with on-site and electron microscope scanning, the judgment criteria for the rupture type are comprehensively analyzed as follows:

[0058] Example 1 is as follows:

[0059] FIG1 is a flow chart of a method for analyzing the failure mechanism of strain-structural surface sliding-type rockburst in a deep-buried drilling and blasting tunnel provided by an embodiment of the present invention. In the present invention, a strain-structural surface sliding-type rockburst risk zone is first divided, and microseismic monitoring is carried out in the rockburst risk zone to establish a strain-structural surface sliding-type rockburst early warning zone. Microseismic monitoring information in the early warning zone during the incubation process of the strain-structural surface sliding-type rockburst is obtained and analyzed.

[0060] Based on the strain-structure surface slip-type rockburst microseismic monitoring information obtained in the rockburst warning area, the spatial distribution characteristics of microseismic events were obtained, the energy evolution law was obtained, and the dynamic stress drop Δσ and the P-wave development degree of each rupture event were calculated. A P-wave development degree greater than or equal to 0.047 indicates tensile failure, and a P-wave development degree less than 0.047 indicates shear failure.

[0061] Then, the occurrence of the structural surface in the rockburst area and the comprehensive evaluation index of the structural surface are statistically analyzed, and the strain-structural surface sliding type rockburst failure mechanism of the specific deep buried drilling and blasting tunnel is determined by comprehensive analysis.

[0062] The method for analyzing the strain-structure plane slip rockburst failure mechanism of deep-buried drilling and blasting tunnels includes the following steps:

[0063] During the excavation of this project, a total of 36 strain-structure surface slip rockbursts occurred. Based on the 36 strain-structure surface slip rockburst cases, the strain-structure surface slip rockburst warning area was determined. The following selects one typical strain-structure surface slip rockburst for analysis:

[0064] Based on the microseismic information in a strain-structure surface slip rockburst warning area that has occurred in a deep-buried drilling and blasting tunnel, the spatial distribution characteristics of the microseismic events are obtained as shown in Figure 2, where Figure (a) shows the distribution characteristics of the microseismic events along the tunnel axis, and Figure (b) shows the distribution characteristics of the microseismic events along the tunnel cross section. The microseismic monitoring data corresponding to steps S3, S4, and S5 are processed.

[0065] First, the energy evolution law of the strain-structural surface sliding type rockburst incubation process is obtained by processing the microseismic information, as shown in Figure 3, where Figure (a) shows the strain-structural surface sliding type rockburst incubation process, and Figure (b) shows the microseismic energy characteristics of the strain-structural surface sliding type rockburst. It is worth noting that the microseismic energy release is large when the rockburst occurs, and the number of microseismic events continues to increase. Based on the microseismic energy of 36 strain-structural surface sliding type rockburst cases, the strain-structural surface sliding type rockburst usually produces a large number of events at the 60% and 90% positions in the incubation process, and at the same time, it will produce large energy events. This is a significant feature and signal of the microseismic information in the strain-structural surface sliding type rockburst incubation process.

[0066] The processed and analyzed microseismic information was then extracted to obtain characteristic parameters such as the corner frequency in the seismic moment frequency domain and the shear wave velocity near the earthquake source. The dynamic stress drop, Δσ, was calculated, revealing the dynamic stress drop evolution during the incubation and occurrence of a strain-structural plane slip-type rockburst. As shown in Figure 4, the maximum dynamic stress drop during the rockburst generation phase is 0.15 MPa. This relatively high dynamic stress drop value indicates that the energy accumulated in the rock mass has not yet been fully released. The dynamic stress drop during the generation phase of a strain-structural plane slip-type rockburst is higher than that during the incubation phase. The concentrated area of ​​dynamic stress drop during the generation phase of a strain-structural plane slip-type rockburst is closer to the structural plane, or distributed across the structural plane.

[0067] The microseismic information was processed secondary to obtain and calculate the P-wave development degree, and data visualization was performed to evaluate the evolution of microcracks during the destruction process. The proportion of tension and shear effects and the evolution of rupture types were obtained, as shown in Figure 5. In the early stage of rockburst incubation, rock rupture events were mainly tension ruptures, and the microseismic energy was generally small. In the middle and late stages of rockburst incubation, shear failure events increased and had higher energy. During the rockburst incubation stage, shear and tension rupture events occurred alternately, with a relatively close ratio. The microseismic energy of shear failure events was relatively large. In addition, high-energy and small-scale shear failure events also occurred during the incubation stage of strain-structure surface slip-type rockbursts, indicating that there was a certain amount of slip and dislocation before the strain-structure surface slip-type rockburst, and these shear failure events were distributed near or on the structural surface.

[0068] Finally, the structural surface information of the strain-structural surface sliding type rockburst area, including the inclination and dip angle, is obtained and the windows are divided, as shown in Figure 6. As shown in Table 1, the comprehensive index L of the structural surface near the rockburst area is obtained by statistical calculation. P ;

[0069] Table 1. Structural surface occurrence and comprehensive evaluation indicators in rockburst areas

[0070] During the subsequent excavation of this project, rock burst microseismic monitoring will be carried out in the rock burst area to obtain microseismic monitoring information in the warning area, and the spatial distribution characteristics of microseismic events, the microseismic time series of the strain-structural surface sliding type rock burst incubation process, the dynamic stress drop evolution characteristics and the fracture type evolution law during the strain-structural surface sliding type rock burst incubation and occurrence process will be obtained. Finally, through on-site investigation, information on the structural surface near the rock burst area will be obtained.

[0071] The energy evolution law can be used to obtain the energy generated by shear fracture and tensile fracture during the occurrence of strain-structural surface sliding type rockburst; the dynamic stress drop can be used to obtain the stage at which the stress change is concentrated and the evolution of microcracks when the strain-structural surface sliding type rockburst occurs; the evolution of the strain-structural surface sliding type rockburst rupture type can determine the proportion of tension and shear and the released energy after the destruction; through on-site investigation, the properties of the structural surface of the rockburst area can be determined, and finally a comprehensive analysis is conducted to determine the specific strain-structural surface sliding type rockburst failure mechanism of the deep buried drilling and blasting tunnel. The present invention provides a practical and feasible innovative idea for revealing the strain-structural surface sliding type rockburst failure mechanism of the deep buried drilling and blasting tunnel.

[0072] The above description is merely a preferred embodiment of the present disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also encompass other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned inventive concept. For example, a technical solution formed by mutually replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A method for analyzing the failure mechanism of strain-joint slip type rockburst in a tunnel by drill and blast method, characterized in that, Including the following steps: Step S1: Based on the engineering geological conditions, stress conditions, and external disturbance conditions, divide the strain-structural plane slip type rockburst risk area, carry out microseismic monitoring work in the rockburst risk area, and determine the rockburst warning area; Step S2: Analyze the occurrence and quantity of the structural planes of the strain-structural plane slip type rockburst that has occurred; Step S3: Collect and process the microseismic monitoring information in the rockburst warning area, including data cleaning, waveform identification, arrival time picking, and format conversion; Step S4: Comprehensively analyze the occurrence and quantity of the structural planes of the strain-structural plane slip type rockburst obtained in S2 and S3, and the microseismic monitoring information, obtain the laws of the occurrence and quantity of the structural planes and the characteristics of microseismic activity, and analyze in combination with the rupture mechanism of the strain-structural plane slip type rockburst; Step S5: Based on the P-wave development degree, combined with on-site and electron microscope scanning, comprehensively analyze the rupture type.

2. The analysis method for the strain-structural plane slip type rockburst failure mechanism of a drill-blast tunnel according to claim 1, characterized in that, In Step S1, the engineering geological conditions of the strain-structural plane slip type rockburst risk area are that the structural planes are developed, the tangential stress of the tunnel intersects the strike of the structural plane horizontally or at an angle less than the set angle, the external disturbance condition is blasting dynamic disturbance, and there is a disturbance source in the strain-structural plane slip type rockburst risk area.

3. The analysis method for the strain-structural plane slip type rockburst failure mechanism of a drill and blast tunnel according to claim 1, wherein The rockburst warning area described in Step S1 is determined through the study of the spatial distribution of the rockburst risk area in the tunnel; the rockburst warning area includes: the distribution range of microseismic events in front of and behind the heading face, the distribution range of microseismic events on the left and right sides perpendicular to the tunnel axis, and the distribution range of microseismic events above and below the tunnel axis perpendicular to the tunnel axis.

4. The analysis method for the strain-structural plane slip type rockburst failure mechanism of a drill and blast tunnel according to claim 1, characterized in that Step S2 is specifically: The occurrence of the structural plane of the strain-structural plane slip type rockburst is reflected by the dip and dip angle of the structural plane, and the quantity of the structural plane of the strain-structural plane slip type rockburst is reflected and expressed by the comprehensive index of the structural plane; The comprehensive index is calculated according to the following formula: L P = (L1 + L2 + L3 +.......L N ) / A Among them, L P represents the comprehensive index of structural planes, A represents the area of a window, and L N represents N structural planes within the window.

5. The analysis method for the strain-structural plane slip type rockburst failure mechanism of a drill and blast tunnel according to claim 1, characterized in that The microseismic monitoring information described in Step S3 includes: the spatial distribution characteristics of microseismic events, the evolution law of microseismic energy, the cumulative energy release rate during the rockburst incubation process, the evolution characteristics of the dynamic stress drop during the rockburst incubation process, and the evolution of the rock rupture type at different stages of the strain-structural plane slip type rockburst; among them, the spatial distribution characteristics of microseismic events are obtained through the collection and processing of microseismic monitoring data.

6. The method for analyzing the failure mechanism of the strain-structural plane slip type rockburst in the drill and blast tunnel according to claim 1, characterized in that Step S4 is specifically: By extracting microseismic monitoring information, the corner frequency in the frequency domain of the seismic moment, the shear wave velocity parameter near the seismic source are obtained, and the dynamic stress drop is calculated to obtain the evolution characteristic law of the dynamic stress drop. The calculation formula is as follows: Among them, Δσ represents the dynamic stress drop, M0 represents the seismic moment, f c represents the corner frequency in the frequency domain, β represents the shear wave velocity of the earthquake source, and k represents the relationship between the corner frequency f c and the rupture radius r of the earthquake source; Perform secondary processing on the microseismic monitoring information to evaluate the rupture type, which is specifically obtained from the development degree of the longitudinal wave P-wave. The development degree of the P-wave is P D is defined as follows: Among them, N is the number of sensors triggered by microseismic events; is the amplitude of the first motion of the P-wave recorded in the i-th triggered sensor; Is the maximum amplitude in the waveform recorded by the i-th triggered sensor.

7. The analysis method for the strain-structural plane slip type rockburst failure mechanism of a drill and blast tunnel according to claim 1, characterized in that, The judgment criteria for the rupture type described in step S5 are as follows:

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